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J, Yuan X, Yushchenko O, Zarebski K A, Zavertyaev M, Zhang L, Zhang Y, Zhang Y, Zhelezov A, Zheng Y, Zhu X, Zhukov V, Zucchelli S
European Organization for Nuclear Research (CERN), Geneva, Switzerland.
Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
Phys Rev Lett. 2017 May 12;118(19):192001. doi: 10.1103/PhysRevLett.118.192001. Epub 2017 May 8.
The production of J/ψ mesons in jets is studied in the forward region of proton-proton collisions using data collected with the LHCb detector at a center-of-mass energy of 13 TeV. The fraction of the jet transverse momentum carried by the J/ψ meson, z(J/ψ)≡p_{T}(J/ψ)/p_{T}(jet), is measured using jets with p_{T}(jet)>20 GeV in the pseudorapidity range 2.5<η(jet)<4.0. The observed z(J/ψ) distribution for J/ψ mesons produced in b-hadron decays is consistent with expectations. However, the results for prompt J/ψ production do not agree with predictions based on fixed-order nonrelativistic QCD. This is the first measurement of the p_{T} fraction carried by prompt J/ψ mesons in jets at any experiment.
利用大型强子对撞机底夸克探测器（LHCb）在质心能量为13 TeV时收集的数据，研究了质子-质子碰撞前向区域喷注中J/ψ介子的产生。使用横向动量(p_T)(喷注)>20 GeV且在伪快度范围2.5<(\eta)(喷注)<4.0内的喷注，测量J/ψ介子携带的喷注横向动量分数(z(J/ψ)\equiv p_T(J/ψ)/p_T(喷注))。在b强子衰变中产生的J/ψ介子的观测(z(J/ψ))分布与预期一致。然而，直接产生J/ψ介子的结果与基于固定阶非相对论量子色动力学的预测不一致。这是在任何实验中首次测量喷注中直接产生的J/ψ介子携带的(p_T)分数。
